Generic Dropper!E4A854C5

This page shows details and results of our analysis on the malware Generic Dropper!E4A854C5

Download Current DAT: 6712

Threat Detail

Malware Type: Trojan

Malware Sub-type: N/A

Discovery Date: 2008-09-25

Next Steps:

Overview
Characteristics
Symptoms
Method of Infection
Removal

Overview

This is a Trojan detection. Unlike viruses, Trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include e-mail, malicious or hacked Web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.

Minimum DAT

5391 (2008-09-24)

Updated DAT

5391 (2008-09-24)

Minimum Engine

N/A

File Length

35840

Description Added

2008-09-25

Description Modified

2008-09-25

Malware Proliferation

Characteristics

File Property	Property Value
FileName	sxs2.exe
McAfee Detection	Generic Dropper
Length	35,840 bytes
CRC	E4A854C5
MD5	E0A4D700C659573D6236214F9B227609
SHA1	3A632FFD20A29920C14D0DFD33B1427B936E1B5D

Other Common Detection Aliases

Company Name	Detection Name
AVG (GriSoft)	Dropper.Generic.PNH
Kaspersky	Trojan-Dropper.Win32.Agent.bwn
norman	sandbox: w32/malware
Symantec	W32.SillyFDC
Trend Micro	WORM_AGENT.AACC

Avert Labs has observed the following system activities:

Activity	Risk Level
Hides itself by using commonly used filenames	Critical
Modifies memory of other processes	Critical
Uses shared memory of other processes	Low
Creates registry keys and data values to persist on OS reboot	Informational

System Changes

These are general defaults for typical path variables. (Although they may differ, these examples are common.):
%WinDir% = \WINDOWS (Windows 9x/ME/XP/Vista), \WINNT (Windows NT/2000)
%SystemDir% = \WINDOWS\SYSTEM (Windows 98/ME), \WINDOWS\SYSTEM32 (Windows XP/Vista), \WINNT\SYSTEM32 (Windows NT/2000)
%ProgramFiles% = \Program Files

The following registry elements have been changed:

hkey_local_machine\software\microsoft\windows\currentversion\explorer\advanced\folder\hidden\showall\

checkedvalue = 0x00000001

hkey_users\s-1-5-21-1202660629-602609370-839522115-500\software\microsoft\windows\currentversion\run\

system = [binary data]

The applications created the following network connection(s):

http

hxxp://172.16.199.200/1/***********

Symptoms

This symptoms of this detection are the files, registry, and network communication referenced in the characteristics section.

Method of Infection

Trojans do not self-replicate. They are spread manually, often under the premise that the executable is something beneficial. Distribution channels include IRC, peer-to-peer networks, newsgroup postings, e-mail, etc.

Removal

All Users:

Please use the following instructions for all supported versions of Windows to remove threats and other potential risks:

1.Disable System Restore .

2.Update to current engine and DAT files for detection and removal.

3.Run a complete system scan.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

1. Please go to the Microsoft Recovery Console and restore a clean MBR.

On windows XP:

Insert the Windows XP CD into the CD-ROM drive and restart the computer.
When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
Select the Windows installation that is compromised and provide the administrator password
Issue 'fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.

On Windows Vista and 7:

Insert the Windows CD into the CD-ROM drive and restart the computer.
Click on "Repair Your Computer"
When the System Recovery Options dialog comes up, choose the Command Prompt.
Issue 'bootrec /fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.